Custom Format Not Editable

[Antix-Development]

If you open a project which uses a custom export format script, you are unable to edit the script because the edit button is not present.

I know it's not a giant issue but it would be good that if when a project with a custom format script is opened... the edit button was present :)

[ImperialPanda]

Found the same issue. The edit button comes back after selecting a different export format and then returning to custom, but this seems to wipe out the custom export format.